Clean your refrigerator weekly, and at a certain time, to keep your grocery bill low.If you clean your refrigerator every week just prior to grocery shopping, you’ll assure that any leftovers you want to use up will be taken into account when you shop and won’t go to waste. Add to this the fact that you won’t have a huge cleaning task once a week. Add to this the fact that you’ll be a more effective general in your kitchen if your culinary resources are fresher on your mind.